There are easy way to install your header in your Blogspot...
1. The first step is create header for your blogspot (to create refer my post about it ->click this..For example this is your header..

2. Secondly, you need to click (layout-->page elements)

3. Thirdly, choose header and click edit...

4. Then, choose file if the image store in your computer or you can store it at image hosting like Photobucket..

5. Lastly, preview first if you want and then click save...Done!..


p/s --> if you want me to help to make header for your blog please contract me at shoutmix..tq